1) Cynical 2) Disbelieving 3) Distrustful 4) Doubtful 5) Doubting 6) Hesitant 7) Incredulous 8) Pessimistic 9) Skeptical 10) Suspicious 1) Distrustful 2) Doubting 3) Marked by or given to doubt 4) Questioning 5) Skeptical 
• Alt. of Scepticism
skeptical, sceptical 1. Tending not to believe or to accept things but to question them. 2. Marked by a doubting attitude. 3. Referring to doubt; questioning; such as, a skeptical attitude or being skeptical of political promises. 4. Relating to or characteristic of skeptics or skepticism.